Flow of Diagnosis

Visual inspection is an important part of diagnosis. The inspection should be done to locate obvious reasons for customer concern.

When performing visual inspection, check all items for abnormal conditions. Look for such items as bare, broken, or disconnected wires. For the speed control to function properly, speed control servo (throttle actuator) and throttle linkage should operate freely and smoothly.

Any concerns found by the visual inspection should be corrected before further tests of the speed control system are made. The following items should be inspected.
^ If the amber RABS, ABS or 4WABS indicator in the instrument cluster stays lit when the ignition switch is in the RUN position, then check those systems before continuing with the speed control diagnostics.
^ Does the horn work? If not, check the horn circuit fuse, horn relay and horn circuit wiring.
^ Do the stoplamps light when the brake pedal is depressed? If not, check the stoplamp circuit fuse, rear lamps, wiring and stoplamp switch.
^ If visual inspection has not revealed customer concern, GO to Symptom Chart. Symptom Related Diagnostic Procedures